Submission #776544

#	Time	Username	Problem	Language	Result	Execution time	Memory
776544		HD1	Table Tennis (info1cup20_tabletennis)	C++14	87 / 100	278 ms	41944 KiB

tabletennis

//we are all lost trying to be someone.
#include <bits/stdc++.h>
#define fastio ios_base::sync_with_stdio(0); cin.tie(0);
#define sz(x) ll(x.size())
#define reve(x) reverse(x.begin(),x.end())
#define ff first
#define ss second
using namespace std;
typedef long long ll;
typedef long double ld;
typedef pair<ll,ll> ii;
const ll MAX=3*(1e6+100);
const ll mod=1e9+7;
const ll inf=1e18+7;
ll A[MAX], s[1610];
vector<ll >c;
bool nice=false;
ll n, k;
map<ll,ll>M;
void solve(ll sum){
	ll j=n+k-1;
	for(ll i = 0; i < n+k and A[i] < sum/2; i++){
		while(j-1 >= 0 and A[j-1] >= sum-A[i]){
			j--;
		}
		if( j > i and A[j] == sum-A[i]){
			c.push_back(A[j]);
			c.push_back(A[i]);
			if(sz(c) >= n){
				nice=true;
				return;
			}
		}
	}
	return;
}
int main(){
	cin>>n>>k;
	for(ll i = 0; i < n + k; i++){
		cin>>A[i];
	}
	sort(A, A+n+k);
	if(n<4*k){
			for(ll i = 0; i < n+k; i++){
					for(ll j = 0; j < n+k; j++){
							if(i!=j){
									ll sum=A[i]+A[j];
									solve(sum);
									if(nice)break;
									c.clear();
							}
					}
					if(nice)break;
			}
			sort(c.begin(),c.end());
			for(ll i = 0; i < sz(c); i++){
				cout<<c[i]<<" ";
			}
			cout<<'\n';
			return 0;
	}
	ll cont = 0;
	ll aux = k + 1;
	if(n+k>=4*k) aux = 2*k;
	for(ll i = 0; i < aux; i++){
            for(ll j = n+k-1; j > n+k-1-aux ; j--){
                s[cont] = A[i] + A[j];
                M[s[cont]]++;
                cont++;
            }
	}
	if(n+k >= 4*k){
        cont=0;
        for(auto it: M){
            if(it.ss>=k){
                s[cont]=it.ff;
                cont++;
            }
        }
	}
    for(ll i=0; i<cont; i++){
        solve(s[i]);
        if(nice)break;
        c.clear();
    }
	sort(c.begin(),c.end());
	for(ll i = 0; i < sz(c); i++){
		cout<<c[i]<<" ";
	}
	cout<<'\n';
}

• Subtask 1: 11 / 11
• Subtask 2: 9 / 9
• Subtask 3: 14 / 14
• Subtask 4: 15 / 15
• Subtask 5: 9 / 9
• Subtask 6: 14 / 14
• Subtask 7: 15 / 15
• Subtask 8: 0 / 13